<template>
  <el-breadcrumb class="app-breadcrumb" separator="/" style="float: left">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
        <span
          v-if="item.redirect === 'noRedirect' || index == levelList.length - 1"
          class="no-redirect shenglue"
          >{{ item.meta.title }}</span
        >
        <a v-else class="shenglue">{{ item.meta.title }}</a>
        <!-- 具有跳转功能 -->
        <!-- <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a> -->
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup>
import { useRoute, useRouter } from 'vue-router'
import { ref, watchEffect } from 'vue'
const route = useRoute()
const router = useRouter()
const levelList = ref([])
function getBreadcrumb() {
  // only show routes with meta.title
  let matched = route.matched.filter((item) => item.meta && item.meta.title)
  const first = matched[0]
  const homepage = '/index'
  // 判断是否为首页
  if (!isDashboard(first)) {
    matched = [{ path: homepage, meta: { title: '首页' } }].concat(matched)
  }

  levelList.value = matched.filter(
    (item) => item.meta && item.meta.title && item.meta.breadcrumb !== false
  )
  const uniqueArray = []
  const newLevelList = []
  levelList.value.forEach((value) => {
    if (!uniqueArray.includes(value.path)) {
      uniqueArray.push(value.path)
      newLevelList.push(value)
    }
  })
  levelList.value = newLevelList
}
function isDashboard(route) {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.trim() === 'Index'
}
function handleLink(item) {
  const { redirect, path } = item
  if (redirect) {
    router.push(redirect)
    return
  }
  router.push(path)
}

watchEffect(() => {
  // if you go to the redirect page, do not update the breadcrumbs
  if (route.path.startsWith('/redirect/')) {
    return
  }
  getBreadcrumb()
})
getBreadcrumb()
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  // .no-redirect {
  //   color: #97a8be;
  //   cursor: text;
  // }
}
@media (max-width: 768px) {
  /* 手机样式 */
  .app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 6px;
  line-height: 50px;
  margin-left: 8px;
  }
}

@media (min-width: 769px) {
  /* 电脑样式 */
  .app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;
  }
}
</style>
